GH-311 Overview
GH-311 ULTRASOUND MOTION SENSOR USER'S GUIDE .united77. GH-311Ultrasound Motion Sensor The GH-311 ultrasonic Motion sensor provides precise, non-contact distance measurements from about 2 cm (0.8 inches) to 3 meters (3.3 yards). It is very easy to connect to microcontrollers such as the BASIC Stamp®, SX or Propeller chip, requiring only one I/O pin.